So here's the final part list, everthing is either already received or on order.
This was way more than I wanted to spend on a server and I'll probably have buyer's remorse for the next year but it'll probably offer me many good years of service.
CPU: Pentium G3450
Motherboard: SuperMicro X10SLM+-F (the X10SLL wasn't in stock anymore)
RAM: 1x8GB Crucial ECC 1.35v RAM
Boot Device: 2x Sandisk Ultra Fit 32GB
Storage Drives: 2x WD Red 1TB in mirrored vdev
PSU: SeaSonic G-360 80 Gold
Case: Fractal Design Deine R4 (The Tesseract was just too cheaply made in the end and I got a good deal on the R4).
So in the end, yeah it is low capacity, but it is all quality components.